Man this is getting good
I don't want to get into a pissing contest because i'm not that kind of a person, but there some things that need to be brought to light.
First and foremost thanks (Robert 1320) those are excellent results using proComp heads. One question is were/are these heads the old ProAction/ProTop line heads or are they the newer ProComp heads? i ask this question because because they are not the same heads.
Protop Line/proAction heads are cast in Australia/New Zealand, they went belly up a couple yrs ago i suppose because their marketing/promoting was not good enough to stay in business. They had excellent heads and would flow over 300CFM out of the box. RHS bought that foundry and now offer the heads as Pro Action heads and are completely machined by RHS their 235's flow over 315CFM out of the box, they also come with 11/32" valve stems. ProComps are 5/16" valve stems.
Here is the data on ProTop Line heads
FEATURES
Multi-angled intake valve seats
Radius exhaust valve seats
Improved valve guide design
Refined water jacket design
Manganese intake valve guides
Bronze exhaust valve guides
Hardened valve seats
Extra-thick deck faces ( NOTE )
Clean Cast Technology™
Go here for the full data.
http://www.racingheadservice.com/Inf...hevy-Heads.asp
ProCmp heads are Chinese casting and machined in China, if you want CNC porting they are ported at Direct Motion in Ca.
Procomp does not have a head casting that will port to 225 runners at this time. I was intrested in these heads until i saw a couple sets of these heads and the 3/8" deck thickness.
Below see supporting emails directly from the head porter himself at Direct Motion.
Read from bottom to top.
Hey Darren,
>
> Forgot to add, don't worry about the valve job i'll
> take care of that, just do them like you did my
> friend
> Richard Blalocks BBC heads.
> Also do these new heads have the Stahl bolt pattern
> on the exhaust ports or the conventional chevy
> pattern. If you are doing these holes i would prefer
> the Stahl pattern.
>
> John Allen
>
> --- john letter <
[email protected]> wrote:
>
> > Hi Darren,
> > I just recieved a copy of your email to Richard
> at
> > ProComp about the SBC heads, as per our emails
> early
> > last month, i'm intrested in these heads to go on
> a
> > 383" blown alcohol motor. I'm more intrested in
> > getting the exhaust flow up and i think the 20%
> > increase will help a lot for this motor. As for
> the
> > intakes if we can get the flow up around 300CFM
> with
> > a
> > port size to match a felpro 1206 gasket i think
> they
> > would work well, 5 or 6 weeks out is not a
> problem,
> > because i'm still working on the Anglia chassis
> >
> >
> > Copy of email from Richard
> >
> > Richard as of right now there is not a casting
> from
> > ProComp that will flow trying to go out to 225cc
> int
> > volume without breaking into water, with that
> being
> > said we have a 210cc port that is working out the
> > best
> > this will need a 2.08 intake valve we also have a
> > new
> > exhaust port that flows 20% better, however this
> > won't
> > be ready for them until we digitize this head and
> > run
> > the program on another head, this will take around
> > five weeks from now. Keep in touch with me and I
> > will
> > update you as this evolves
> >
> > Thank you Darren San Angelo
> >
> > Thanks in advance
> >
> > John Allen
Like i said not trying to get into a pissing contest but these are facts.
Zip.